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Tissue-resident macrophages have pivotal functions for tissue defense and homeostasis. Two main discoveries have changed our current understanding of macrophage development: Their embryonic origin and their ability to self-renew throughout the lifespan. It is now well accepted that most tissue-resident macrophages are long-lived cells derived from a transient hematopoietic wave of erythro-myeloid...
The paradigm that all blood cells are derived from hematopoietic stem cells (HSCs) has been challenged by two findings. First, there are tissue-resident hematopoietic cells, including subsets of macrophages that are not replenished by adult HSCs, but instead are maintained by self-renewal of fetal-derived cells. Second, during embryogenesis, there is a conserved program of HSC-independent hematopoiesis...
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